Chemical Engineering MCQs

Page No. 277

Calorific value of dry wood may be around ______________ Kcal/kg?


a5

✓


b50

✖


c500

✖


d5000

✖


View Answer 5

Combustion of pulverised coal as compared to that of lump coal ________________?


aDevelops a non-luminous flame

✖


bDevelops a low temperature flame

✖


cCan be done with less excess air

✓


dProvides a lower rate of heat release

✖



During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the _______________ of the mass?


aDensity

✓


bPorosity

✖


cElectrical resistivity

✖


dNone of these

✖


View Answer Density

Coal tar fuel – 200 (CTF 200) is a mixture of __________________?


aPitch and creosote oil

✓


bLight oil and pitch

✖


cAnthracene and crecosote oil

✖


dSolar oil and pitch

✖



Sometimes water is sprayed during coal charging in the coke oven, which helps in ________________?


aPrevention of clinker formation in the oven

✖


bControlling the dust nuisance while charging the coal

✖


cReducing the cracking of hydrocarbons in the gas and increasing the percentage of CO & H2 in the gas (due to the endothermic reaction represented by C + H2O = CO + H2)

✖


dAll A., B. and C.

✓


View Answer All A., B. and C.

The sequence of absorption in flue gas analysis by Orsat’s apparatus is respectively_______________________?


aCO2, O2, CO

✓


bCO, O2, CO2

✖


cCO2, CO, O2

✖


dO2, CO2, CO

✖


View Answer CO2, O2, CO

____________ process is meant for direct hydrogenation of coal to produce liquid fuel?


aFischer-Tropsch

✖


bBergius

✓


cLurgi

✖


dNone of these

✖


View Answer Bergius

Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its_________________?


aCaking index

✖


bYield of carbonised products

✖


cFriability & oxygen content

✓


dCalorific value

✖



Critical Air Blast (CAB) value of coke is a direct measure of its__________________?


aReactivity

✓


bHardness

✖


cStrength

✖


dNone of these

✖


View Answer Reactivity

A particular coal is said to be free burning when it __________________?


aBurns completely

✖


bGives smokeless burning

✖


cShows little or no fusing action

✓


dNone of these

✖



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